diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index f2606a12..5626ca94 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -19,11 +19,15 @@ jobs:
     strategy:
       matrix:
         python-version:
-         - "3.6.2"
+         - "3.6"
          - "3.10"
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     steps:
       - uses: actions/checkout@v1
+      - name: Install Python
+        uses: actions/setup-python@v4
+        with:
+          python-version: ${{ matrix.python-version }}
       - uses: psf/black@stable
       - name: Build
         run: |
@@ -42,7 +46,7 @@ jobs:
     strategy:
       matrix:
         python-version:
-         - "3.6.2"
+         - "3.6"
          - "3.10"
     services:
       mysql:
@@ -57,9 +61,13 @@ jobs:
           --health-interval 5s
           --health-timeout 2s
           --health-retries 3
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     steps:
       - uses: actions/checkout@v1
+      - name: Install Python
+        uses: actions/setup-python@v4
+        with:
+          python-version: ${{ matrix.python-version }}
       - uses: psf/black@stable
       - name: Build
         run: |
@@ -77,7 +85,7 @@ jobs:
     strategy:
       matrix:
         python-version:
-         - "3.6.2"
+         - "3.6"
          - "3.10"
     services:
       postgres:
@@ -92,9 +100,13 @@ jobs:
           --health-interval 5s
           --health-timeout 2s
           --health-retries 3
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     steps:
       - uses: actions/checkout@v1
+      - name: Install Python
+        uses: actions/setup-python@v4
+        with:
+          python-version: ${{ matrix.python-version }}
       - uses: psf/black@stable
       - name: Build
         run: |